Add initial setup for local HTTPS debugging and Nginx configuration

- Introduce `setup-certs.sh` script for generating trusted local TLS certificates using mkcert.
- Add Nginx configuration files for local and Docker environments to handle HTTPS requests and proxy to backend services.
- Update `docker-compose.yaml` to include Nginx service for unified TLS entry and adjust frontend service ports for local development.
- Create `AGENTS.md` and `README.md` files to document the local HTTPS setup process and usage instructions.
- Modify backend startup commands in `README.md` for consistency with new requirements.
- Add `.gitignore` to exclude generated certificates from version control.

.claude/launch.json

@@ -0,0 +1,13 @@
+{
+  "version": "0.0.1",
+  "configurations": [
+    {
+      "name": "ai-video-admin",
+      "runtimeExecutable": "npm",
+      "runtimeArgs": ["run", "dev", "--", "-p", "3001"],
+      "cwd": "frontend",
+      "port": 3001,
+      "autoPort": false
+    }
+  ]
+}